diff --git a/.gitignore b/.gitignore
index 1f68578..fa1a833 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ docs
 .cache/plugin/social
 mkdocs-hooks/__pycache__
 public
+result-doc
diff --git a/packages/md-manual/default.nix b/packages/md-manual/default.nix
index 662c7d7..5df2e27 100644
--- a/packages/md-manual/default.nix
+++ b/packages/md-manual/default.nix
@@ -1,10 +1,16 @@
-{ stdenvNoCC, pkgs }:
+{
+  stdenvNoCC,
+  pkgs,
+  perl,
+}:
 stdenvNoCC.mkDerivation {
   pname = "md-manual";
   version = "1.0.0";
 
   src = ./.;
 
+  buildInputs = [ perl ];
+
   installPhase = ''
     mkdir $out
     cp index.md $out/index.md
@@ -12,5 +18,10 @@ stdenvNoCC.mkDerivation {
     cp -r ${pkgs.amg.nixpkgs-manual} $out/Nixpkgs/
     cp -r ${pkgs.amg.aux-wiki} $out/Aux
     cp -r ${pkgs.lix-docs.doc}/manualMD $out/Lix
+    chmod -R u+w $out/Lix
+    pushd $out/Lix
+    find . -type f -exec perl -pi -e 's/\<div class="warning"\>\n\n/\?\?\? bug\n\n\ \ /g' {} \;
+    popd
+    chmod -R u-w $out/Lix
   '';
 }
diff --git a/packages/nixpkgs-manual/default.nix b/packages/nixpkgs-manual/default.nix
index c659d94..f609c2e 100644
--- a/packages/nixpkgs-manual/default.nix
+++ b/packages/nixpkgs-manual/default.nix
@@ -90,6 +90,7 @@ stdenvNoCC.mkDerivation {
     find . -type f -exec perl -pi -e 's/\s*:::{.tip}\n/!!! tip\n\ \ \ \ /' {} \;
     find . -type f -exec perl -pi -e 's/\s*:::{.example}\n/!!! example\n\ \ \ \ /' {} \;
     find . -type f -exec sed -i 's/\s*::://g' {} \;
+    find . -type f -exec sed -i 's/\n```nix/\ \ \ \ ```nix/g' {} \;
     popd
   '';